Safety mineras lamp



2 Sheets-Sheet 1.

(No Model.)

A.L. NELSON, J. KNAP'PER 8a LYTAYLOR. SAFETY MINER'S LAMP.

Patented May 3, 1892.

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(No Model.) 2 sham-sheen 2.

A. L. NELSON, J. KNLPPLR a. 1. TAYLOR. SAFETY MINERS LAMP.

No. 474,182. Patented- May 3, 1892.

l UNITED STATES PATENT OFFICE ANDREV IANELSON, JOSEPH KNAPPER, AND ISAACTAYLOR, OF DUNBAR,

PENNSYLVANIA. l T

SAFETY MIN ERS LAM P..

SPECIFICATION forming part of ,Letters Patent )Ta-474,182, dated May 3,1892.

Y Application iiled June 22, 1891.` Serial No. 897,051. (No model.)

To all whom it may concern:

Be it known that we, ANDREW L. NELSON, JOSEPH KNAPPEE, and ISAAC TAYLOR,citizens of the United States, residing at Dunbar, in the county ofFayette and State of Penusylvania, have invented a new and useful SafetyMiners Lamp, of which the following is a specification.

This invention relates to lamps employed 1o in mines for detecting thepresence of gases or fire-damp; and the object of the same is to'produce an improved lamp of this character which will test thecondition of the air at the top of galleries, which will not explode ifthe air be heavily charged with gas, and which cannot be tampered withby unauthorized persons.

To this end the invention consists in a gasalarm lamp of theconstruction hereinafter 2o more. fully described and claimed, wherebythe above and other advantageous results are attained,and as illustratedou the two sheets of drawings, wherein- Figure l is a side elevation ofthis lamp. 2 5 Fig. 2 is a central longitudinal vertical section throughtwo of the vertical tubes. Fig. 3 is a perspective sectional detail ofthe lampbody, comprising the oil-cup, the extinguisher, and the burner,the parts being slightly separated. ,l

Referring to the said drawings, the letter C designates the oil-cup, Bthe burner, G the globe, F the frame of the lamp, I the inletchamber,and H the carrying handle or bail, these parts being of the specificconstruction described below.

The oil-cup O is cylindrical, and the burner B rises from the center ofthe top thereof, beingof any approved construction which will 4o servein a lamp Of this character. Around the burner is a short upright tubel, rising from the top of the oil-cup and having openings 2 near itsbase, through which air is supplied to support combustion. The wick ispreferably controlled bya wick-raising device 2, extending through avertical pipe A in the body of the oil-cup, as shown, and by this meansthe Wick can be manipulated from outside of the lamp.

4t is a disk resting upon the body of the oil- 5o cup and having anopening at its center of a size to iit around the upright tube l, andaround this opening rises a small flange 5, having' openings 6, adaptedto register with those in said upright 2. l f

The frame F of this lamp comprises a cylindrical base lO, having threadson its inner face and into which the oil-cup O, with the i disk 4:, isadapted to be screwed, as seen in Fig. 2. At the upper end of this frameis the 6o inlet-chamber I described below, and about four tubes llconnect this chamber with the base passing intermediately through earsl2 on a collar 13. The base has a large opening in the center O'f 'itstop surrounded by an upright 65 flange 14, which is internallyscrew-threaded, and the globe G is adapted `to be passed upwardlylthrough the flange and bear against j a packing-ring 15 beneath thecollar 13.

16 is a closing-ring adapted to be screwed 7o into tho upright flange 14around the upright tube I, and on this ring rests a packing-ring l5',which bears against the lower end of the globe Gr and holds thesametightly in place.

It is to be understood that in .assembling` the parts the globe and theclosing-ring are put in first, and afterward the Oil-cup, with its 4disk, is inserted. y

Rising from the collar 13 is a cone 17, with a tubular extension ISleading nearly to the 8o bottom of the inlet-chamber I, and surroundingthese members is a gauze cylinder I9, as shown. A gauze strip 19surrounds the iiange 5, rising from the disk e, and covers the openings6 therein. The inlet -chamber is com- 85 posed of a base 20, havingopenings 2l, into which the tubes Il are screwed, and having uprightsides 22, which are internally screwthreaded for some distance fromtheir upper ends.

23 is a gauze sheet standing across this chamber, as shown. 24 is aclosing-cap having depending sides 25, which screw into the sides 22 ofthe chamber and having a central inletopening 21B. 95 The handle I-I isconnected to eyes 27 on the sides 22 of the base of this chamber.

With the above construction of parts the uses and advantages of thislamp are as follows: The air entering through -the opening 26 passesinto the chamber I, through the gauze 23, down the tubes 11, and intothe base above the disk it. The height of the iiange 5 forms an annularchamberbetween the disk 4 and the top of the base, and the air passinginto this chamber leads next through the gauze strip 19 and through theregisteringholes 6 and 2 to the burner B. The products of combustionrising from the burner pass upwardly through the cone 17 and extension18,

Aout of the upper end of the latter, thereby heating the inlet-chamber,and downwardly out through the meshes of the gauze cylinder 19. It willthus be seen that this improved lamp takes its air for lcombustion fromthe uppermost point, and hence if the lamp be be used in mines it may beraised to the top of galleries to ascertain the presence of gas orfire-damp therein. The result of the saine would be to increase theflame, because the gas as it is supplied thereto facilitatesconibustion; but by the well-known principle that a blaze will not passthrough a gauze the flame will be neXt extinguished. Although Iv havenot illustrated it, a hose could be led to the opening 26 in theinlet-chamber and air could be conveyed lthereto from a remote point,and by this means the air at the top of a high gallery could be testedwithout raising the lamp thereto.

As before stated, a blaze will not pass through a gauze; but toabsolutely prevent such passage of the blaze the upper part of the gauzecovering is made double, as at X,

(clearly shown in Fig. 2,) the mesh of said double covering beingthereby necessarily arranged out of alignment and making it still moredifficult for escape of flame.

The letter L designates a lock of any approved construction, by means ofwhich the oil-cup is locked in the base 1() of the frame, wherebyunauthorized persons are prevented from tampering with the device, andif this lock be unlocked while the lamp is burning and the operatorseeks to withdraw the oilcup from the frame the iirst movement necessaryin unscrewing it will cause the upright tube 1 to turn within the flange5, Aso that the holes 2 and G will be thrown out of register, and bythis means the flame will be extinguished without damage.

To disconnect the parts of this lantern the oil-cup is wholly unscrewed,after which the disk 4c may be also removed, as will be clear. Thepacking 15 and 15 prevents leakage of air into the blaze around the endsot' the globe, and the screw-threads are so closely fitted a'sto alsopreventleakage between parts. The escaping products of combustion heatthe inlet-chamber, as above stated, and the airsupply is therebyprepared for burning, as well understood in this art.

WVhat is claimed as new is- 1. In al amp, the combination of an-upperinlet-chamber having an opening in the top thereof, tubes leadingdownward from and connected to the bottom of said chamber, a closedcylindrical base comprising a top, to which said tubes are connected andope'n therethrough, a disk screwed into said b'ase and having a centralopening, a iiange rising from said-disk around its opening and itselfhaving openings, a gauze strip outside ot said iiange over the openingstherein, an oil-cup screwed into said base and having a burner, anupright tube on said oil-cup around the said burner thereof and havingopenings near its lower end adapted to register with those in theiiange, a globe iitted over said burner in an air-tight manner, a coneabove said globe, and a gauze covering over said cone, substantially asdescribed.

2. In a lamp, the combination, with an inlet-chamber having an openingin its top, tubes leading downwardly from said chamber, a base intowhich said tubes open, and an oilcup supported by said base and carryinga burner, of a globe mounted on said base, a collar at the upper end ofsaid globe, e ars thereon embracing said tubes, a cone rising from saidcollar and having an upward eXten-l sion opening beneath saidinlet-chamber, and a gauze cylinder surrounding said cone and extension,substantially as described.

3. In a lamp, the combination, with an oilcup and burner, a baseembracing the same and having an annular opening, a gauze strip betweensaid opening and burner, and tubes extending upwardly from said opening,of a globe and chimney surrounding the burner, an inletchamber above thechimney and with which said tube communicates, a gauze disk across thechamber, the latter having an opening in its upper end, and a bail orhandle secured to the side walls of the chamber, substantially asdescribed.

4. In a lamp, the combination of a closed cylindrical` base havinginternal screw threads, a disk screwed therein and havinga centralopening, a iiange rising from said disk around its opening and itselfhaving openings, an oil-cup screwed in said base, abiirner at the centerot' the top thereof, an upright tube on said cup around the biirne-rhaving holes adapted to register with those in the flange, a globe oversaid burner, an upper extension over said globe, an upper inletairchamber, and tubes connecting said air-inlet chamber with the base,substantially as described.

5. In a lamp, the combination, witha base having internal screw-threads,a disk therein having a central opening, anda flange rising from saiddisk around its opening and itself having openings, of an oil-cupscrewed into the base, a lock between said cup and base, a burner at thecenter of the top of the cup, and an upright tube on said cup around theburner having holes adapted to register With In testimony that, We claimthe foregoing as those in the flange, substantially as hereinour own wehave hereto affixed our signatures before set forth. in presence of twoWitnesses.

6. In a lamp, the combination of abase with V5 :L burner and a globearound said burner,` a ANDREW L. NELSON. cone mounted over and extendingupward l JOSEPH KNAPPER. from said globe, and zr gauze covering sur-ISAAC TAYLOR. rounding said cone and having the upper part Vitnesses:

Jhereof of double thickness, substantially as WV. A. BARNES,

x o described.

CHAS. MULLIGAN.

